This Lexicon, aimed at NGOs, lawyers, diplomats and students, follows the same method as the Lexicon of Human Rights - Les définitions des droits de l'homme, published by Martinus Nijhoff Publishers in 2008. Definitions related to the environment are gathered by extracting them from relevant universal scope texts. This ordered grouping of definitions will enlighten the reader about the priorities of the international community regarding environmental law. Definitions are classified in alphabetical order, in separate English and French lists. In each language there is an alphabetical list of common terms with the equivalent second language term in square brackets. The list gives the exact detailed meaning followed by the source of each term. Following this list, a lexicon of the same terms is given under such general themes as "Mammals", "Gas", "Lead". Finally, a list of relevant documents which can be referenced for further information is included.